How To Create a Matte Car Paint Material?
I'm not completely sure what you are going after, but for an image like the top one lighting will be very important.

I don't have car model to demonstrate, but hopefully this gives you some ideas: 



Material nodes:  



If you want that paint fleck look that a lot of car paints have, try using a voronoi texture to modify the normals of a glossy shader underneath the main surface: